Alarm Handling
Alarm ID |
Alarm Name |
Severity |
Clearance Condition |
Trigger Condition |
Impact on the System |
Suggestion |
|---|---|---|---|---|---|---|
01 |
Fan blocked |
Minor |
The fan automatically recovers from blockage. |
The fan blockage signal is at low level for 15s within 30s. |
The current working status is not affected. If overtemperature protection is triggered, the system may transfer to bypass mode. |
Measure: Check the fan and remove sundries.
Measure: Replace the fan. |
02 |
Overtemperature |
Critical |
Fan blocked: The highest temperature of internal components is lower than 65°C. Fan not blocked: The highest temperature of internal components is lower than 50°C. After the temperature is restored to normal, the alarm can be automatically cleared for three times. After that, you need to manually clear the alarm. |
Fan blocked: The highest temperature of internal components exceeds 90°C for 100 ms. Fan not blocked: The highest temperature of internal components exceeds 80°C for 100 ms. |
The system shuts down the inverter and transfers to bypass mode. |
Measure: Decrease the ambient temperature or load.
Measure: Send the device to the maintenance center. |
03 |
High battery voltage |
Critical |
The alarm is automatically cleared when the battery voltage is lower than 58 V. |
The battery voltage is greater than 60 V for 3s. |
The system shuts down the inverter and transfers to bypass mode. |
Measure: Replace the battery or discharge the battery to a normal voltage.
Measure: Send the device to the maintenance center. |
04 |
Low battery voltage |
Minor |
The battery voltage is higher than the EOD threshold and the mains is connected properly. |
The battery voltage is lower than the EOD threshold. |
The system cannot supply power in battery mode. If this alarm is generated in battery mode, the power output will be disconnected. |
Measure: Replace the battery or charge the battery to a normal voltage.
Measure: Send the device to the maintenance center. |
05 |
Output short-circuit |
Critical |
The alarm can be automatically cleared for three times. After that, you need to manually clear the alarm or restart the device. |
The output voltage is lower than 50 V and the current is higher than 20 A for more than five cycles of time. |
The system immediately disconnects the power output. |
Possible cause: The load or cable is short-circuited. Measure: Power off the device to locate and rectify the short-circuit fault, and then power on the device. |
06 |
High output voltage |
Critical |
You need to manually rectify the fault or power off and restart the device. |
The output voltage exceeds the rated voltage by 20 V for 3s. |
The system shuts down the inverter and transfers to bypass mode. |
Measure: Locate the load and remove it.
Measure: Send the device to the maintenance center. |
07 |
Download timeout |
Critical |
You need to manually rectify the fault or power off and restart the device. |
The output overload time exceeds the specification. |
The system disconnects the power output. |
Possible cause: The load exceeds the UPS capacity. Measure: Reduce the load. |
08 |
High bus voltage |
Critical |
When the bus voltage is lower than 360 V, the alarm can be automatically cleared for two times. After that, you need to manually clear the fault or power off and restart the device. |
The bus voltage is greater than 450 V for 200 ms or greater than 470 V for 1 ms. |
The system shuts down the inverter and transfers to bypass mode. |
Measure: Improve the power grid quality.
Measure: Check that the parallel cable and current equalization cable are properly connected.
Measure: Send the device to the maintenance center. |
09 |
Bus short-circuit |
Critical |
You need to manually rectify the fault or power off and restart the device. |
The bus soft-start time exceeds 15s. |
The system cannot start inverter output and transfers to bypass mode. |
Possible cause: The circuit is faulty. Measure: Send the device to the maintenance center. |
12 |
Manual bypass activated |
Minor |
The open-circuit status of the manual bypass is restored. |
The manual bypass port is short-circuited. |
The system transfers to bypass mode. |
Restore the open-circuit status of the manual bypass port. |
13 |
Phase lock failure |
Minor |
Phase locking is successful or the bypass is missing. |
The inverter fails in phase locking within 10s. |
The system cannot start PFC or enter normal mode. |
Possible cause: The power grid frequency is unstable. |
17 |
Bypass abnormal |
Minor |
The bypass voltage or frequency recovers to the normal range. |
The bypass voltage or frequency is out of the normal range. |
|
|
18 |
Low lithium battery level |
Minor |
The battery voltage is higher than the battery EOD threshold plus 4 V and the SOC rises above the alarm threshold. |
Communication is normal. An alarm is generated when the SOC is lower than 20% or the battery voltage is lower than the battery EOD threshold plus 2 V. Communication is abnormal, and the battery voltage falls to 47 V DC. |
The battery level is close to the cutoff threshold. If there is no mains input, the system will shut down after working for a period of time. |
Possible cause: The battery charge level is low. Measure: Charge the battery. |
19 |
Abnormal mains voltage |
Minor |
The mains voltage input recovers. |
|
The system cannot work in normal mode. If this alarm is generated in normal mode, the system transfers to battery mode. |
Check whether the mains voltage input is normal. If the circuit is faulty, send the device to the maintenance center. |
20 |
Lithium battery high temperature protection |
Minor |
The cell temperature drops below the protection threshold. |
|
|
Possible cause: The ambient temperature of the lithium battery is too high or there are abnormal heat sources around the lithium battery. Measure: If the lithium battery cannot be recovered due to protection against abnormality, contact local Huawei engineers to rectify the fault. |
21 |
Lithium battery low temperature protection |
Minor |
The cell temperature rises above the protection threshold. |
|
|
Possible cause: The ambient temperature of the lithium battery is too low or the heater cannot work properly. Measure: If the lithium battery cannot be recovered due to protection against abnormality, contact local Huawei engineers to rectify the fault. |
23 |
Lithium battery low voltage protection |
Minor |
The cell voltage and battery string voltage rise above the respective protection thresholds. |
The lithium battery voltage is less than 44 V. The minimum cell voltage is less than 2.5 V. |
|
Possible cause: The mains power has failed and not been recovered for a long time. The cell consistency is abnormal. The capacity attenuation is too fast or the internal resistance is too large. Measure: If the lithium battery cannot be recovered due to protection against abnormality, contact local Huawei engineers to rectify the fault. |
24 |
Lithium battery overcurrent protection |
Minor |
The battery discharge current drops below the protection threshold. |
Discharge current ≥ 0.93 times of the current limit and Vbus ≤ 40 V for 15s Discharge current ≥ 0.98 times of the current limit and Vbus < 17 V for 8s |
|
Possible cause: The UPS is overloaded. The number of working batteries is insufficient. Measure: Reduce the load. Add batteries. |
27 |
Battery discharge est function enabled |
Minor |
The battery discharge test is complete. |
The shallow or deep discharge function is enabled manually. |
The system transfers to battery mode. |
Measure: Switch off the battery shallow or deep discharge test mode. |
28 |
The battery discharge time reaches the maximum. |
Minor |
Set item 05 battery discharge time to 0 or restart the inverter. |
The battery discharge time reaches the preset value. |
The system cannot supply power in battery mode. If this alarm is generated in battery mode, the power output will be disconnected. |
Check whether the mains input is normal. |
31 |
UPS working in bypass mode |
Minor |
The UPS recovers the inverter output. |
The UPS works in bypass mode. |
The bypass power output alarm does not affect the system working status. The power supply will be disconnected if the bypass input is abnormal. |
|
32 |
UPS locked in bypass state |
Minor |
The inverter switch is turned on again. |
The UPS transfers to bypass mode more than three times within 30 minutes due to overload. |
The system cannot automatically switch back to inverter mode. |
Possible cause: The UPS is overloaded. |
33 |
Overtemperature |
Minor |
Fan blocked: The highest temperature of internal components is lower than 65°C. Fan not blocked: The highest temperature of internal components is lower than 50°C. |
Fan blocked: The highest temperature of internal components exceeds 75°C for 100 ms. Fan not blocked: The highest temperature of internal components exceeds 87°C for 100 ms. |
If the internal temperature of the system is close to the overtemperature protection threshold, a critical overtemperature alarm may be triggered and the system will transfer to bypass mode. |
Measure: Decrease the ambient temperature or load.
|
34 |
Inconsistent number of parallel UPSs |
Minor |
The number of parallel UPSs is consistent with the setting. |
The actual number of parallel UPSs is inconsistent with the setting. |
The current operating status is not affected. Check whether the actual number of parallel UPSs is the same as the setting and whether parallel cables are disconnected. |
Suggestion: Set the number of parallel UPSs to the actual value. |
35 |
Long-time current imbalance |
Minor |
The difference between the UPS load percentage and the parallel system load percentage is within 10% for 10s. |
The difference between the UPS load percentage and the parallel system load percentage is greater than 20% for 10s. |
The current working status is not affected. The system may transfer to bypass mode if it is overloaded. |
Possible cause: The current equalization sampling circuit is faulty. Measure: Send the device to the maintenance center. |
36 |
Overload |
Minor |
The load percentage exceeds 10%. |
The load percentage exceeds 105%. |
The system transfers to bypass mode when the overload time expires. |
Possible cause: The UPS is overloaded. |
37 |
The inverter switch is off in ECO mode. |
Minor |
The inverter switch is turned on. |
The inverter switch is off in ECO mode. |
When the mains input exceeds the ECO range, the power supply is disconnected. |
The inverter output switch is turned on. |
38 |
The number of started inverters is insufficient to carry the load. |
Minor |
The inverter switches of other UPSs in the parallel system are turned on. |
In parallel mode, the number of started inverters is insufficient to support the actual load. |
The system keeps working in bypass mode and cannot transfer back to inverter mode. |
Turn on the inverter switches of other UPSs. |
39 |
Output in battery mode |
Minor |
The mains input recovers. |
The mains input is abnormal. (Refer to the description of minor alarm 19.) |
The current working status is not affected. When the battery backup time or discharge time reaches the preset value, the system will disconnect the power output. |
Check whether the mains input is normal. Possible cause: The circuit is faulty and needs to be returned for repair. |
40 |
Battery capacity mismatch |
Minor |
Increase the lithium battery capacity or reduce the load. |
The maximum discharge power of lithium batteries is less than the actual load power of the UPS. |
After the UPS transfers to battery mode, the lithium battery overcurrent protection may be triggered, which causes the system to power off. |
Reduce the load or add lithium batteries in a timely manner. |
41 |
Lithium battery high voltage protection |
Minor |
The cell or battery string voltage drops below the protection threshold. |
|
|
Possible cause: The busbar voltage input is abnormal and exceeds the normal range. The cell consistency is abnormal. The capacity attenuation is too fast or the internal resistance is too large. Measure: If the lithium battery cannot be recovered due to protection against abnormality, contact local Huawei engineers to rectify the fault. |
43 |
Lithium battery fault |
Minor |
The alarm is not cleared. After batteries are reset, check the status again. |
The cell voltage sampling circuit is faulty. The cell temperature sampling circuit is faulty. The cell voltage is too high or too low. The cell temperature increases abnormally. The cell voltage is severely unbalanced. BMS board circuit fault |
|
Possible cause: sampling fault (see the telecom power manual); cell or equalization circuit fault; charger converter short-circuit, relay fault; switch tube fault Measure: Restart the lithium battery. If the fault persists, replace the lithium battery. |
44 |
Lithium battery exception protection |
Minor |
Check again after the fault is rectified. |
The busbar voltage is too high. The temperature of the board relay and switch tube is too high. The output is short-circuited. Batteries are reversely connected. The output is overloaded. |
|
Possible cause: The UPS is overloaded, the host charger is abnormal, or battery cables are incorrectly connected. Measure: Check the cable connection, check the host status, or reduce the load. |
45 |
Charger shutdown due to lithium battery communication failure |
Minor |
Lithium battery communication recovers. |
Lithium battery communication is unavailable for 40s. |
The SOC data and backup time displayed are inaccurate, and the BMS function fails (lithium battery voltage boosting and current limiting). |
Check that the communications cable is properly connected. |
46 |
Lithium battery reverse connection protection |
Minor |
The lithium battery communication is interrupted or the alarm BP is generated. |
When the lithium battery communication is normal, the battery voltage is less than 10 V. |
The UPS cannot work in battery mode. |
Possible cause: The battery has shut down or has no output. Measure: Check the battery switch status and battery cable connection. |
47 |
UPS locked in inverter mode |
Minor |
The mains is within the ECO range. Shut down the inverter and the UPS transfers to bypass mode; then restart the inverter and the UPS transfers to ECO mode. |
The UPS exits ECO mode for three times within 30 minutes. |
The system cannot automatically switch back to ECO mode. |
Possible cause: The mains exceeds the ECO range. |
48 |
ECO missing |
Minor |
The input voltage and frequency restore to the normal range in ECO mode. |
The input voltage or frequency exceeds the normal operating range in ECO mode. |
The UPS cannot transfer to bypass mode. If the UPS is working in bypass mode, it transfers to another working mode. |
Possible cause: The ECO input is abnormal. Measure: Check whether the ECO input voltage or frequency exceeds the normal range. |
49 |
Inconsistency between the lithium battery capacity and UPS setting |
Minor |
The lithium battery capacity is consistent with as the UPS setting, or lithium battery communication is unavailable. |
The lithium battery capacity is inconsistent with the UPS setting. |
The system working mode is not affected. If the actual capacity of lithium batteries connected is insufficient, the battery backup time may be shortened. |
|
50 |
PFC overcurrent |
Critical |
The alarm is automatically cleared. |
|
The system shuts down the inverter and transfers to bypass mode. |
Measure: Improve the power grid quality.
Measure: Send the device to the maintenance center. |
51 |
Output overcurrent |
Critical |
You need to manually rectify the fault or power off and restart the device. |
The output current exceeds 80 A for 1 ms. |
The system shuts down the inverter and transfers to bypass mode. |
Measure: Locate the load and remove it.
Measure: Send the device to the maintenance center. |
52 |
Bus undervoltage |
Critical |
You need to manually rectify the fault or power off and restart the device. |
|
The system shuts down the inverter and transfers to bypass mode. |
Measure: Locate the load and remove it.
Measure: Send the device to the maintenance center. |
53 |
Timeout in approaching rated output voltage during startup |
Critical |
You need to manually rectify the fault or power off and restart the device. |
The inverter voltage is not soft-started to the rated output voltage within 10s. |
The system shuts down the inverter and transfers to bypass mode. |
Possible cause: The circuit is faulty. Measure: Send the device to the maintenance center. |
55 |
Excessive DC component |
Critical |
The alarm can be automatically cleared for three times. After that, you need to manually clear the fault or power off and restart the device. |
The DC component of the output voltage is greater than 200 mV for 20s. |
The system shuts down the inverter and transfers to bypass mode. |
Measure: Locate the load and remove it.
Measure: Send the device to the maintenance center. |
57 |
Current sensor fault |
Critical |
You need to manually rectify the fault or power off and restart the device. |
In power-on mode, the current sampling deviation exceeds 10% of the total sampling range. |
The system cannot start the inverter and directly delivers output in bypass mode. |
Possible cause: The circuit is faulty. Measure: Send the device to the maintenance center. |
58 |
Low output voltage |
Critical |
You need to manually rectify the fault or power off and restart the device. |
The output voltage is lower than the rated voltage by 50 V for 3s. |
The system shuts down the inverter and transfers to bypass mode. |
Measure: Locate the load and remove it.
Measure: Send the device to the maintenance center. |
59 |
Charger circuit overcurrent |
Critical |
You need to manually rectify the fault or power off and restart the device. |
The charge current is greater than 105 A. |
The system shuts down the inverter and transfers to bypass mode. |
Possible cause: Power grid surge occurs. Measure: Improve the power grid quality. Possible cause: The charger circuit is damaged. Measure: Replace the charger circuit. |
60 |
Load backfeed detected |
Critical |
You need to manually rectify the fault or power off and restart the device. |
When UPSs are connected in parallel, the output backfeed power exceeds 1200 W for 100 ms. |
The system shuts down the inverter and transfers to bypass mode. If other UPSs in the parallel system can deliver output in inverter mode, the UPS that has generated the alarm delivers no output. |
Possible cause: Load backfeed occurs. Measure: Disconnect the load and restart the device. |
71 |
Inconsistent parallel versions |
Critical |
You need to manually rectify the fault or power off and restart the device. |
Parallel UPS protocols are inconsistent. |
If the versions are inconsistent, the non-master UPS exits the parallel system. Otherwise, the UPS transfers to bypass mode because the number of parallel UPSs is inconsistent. |
Possible cause: The UPS software versions are inconsistent. Measure: Upgrade the software to the same version. |
72 |
Parallel current equalization fault |
Critical |
You need to manually rectify the fault or power off and restart the device. |
Equalized current sampling is abnormal. |
The system shuts down the inverter and transfers to bypass mode. If other UPSs in the parallel system can deliver output in inverter mode, the UPS that has generated the alarm delivers no output. |
Possible cause: The circuit is faulty. Measure: Send the device to the maintenance center. |
73 |
Inconsistent parallel output voltage settings |
Critical |
You need to manually rectify the fault or power off and restart the device. |
The output voltage settings of parallel UPSs are inconsistent. |
If the output voltage settings are inconsistent, the non-master UPS exits the parallel system. Otherwise, the UPS transfers to bypass mode because the number of parallel UPSs is inconsistent. |
Possible cause: The output settings are inconsistent. Measure: Set the output voltages to the same value. |
80 |
Parallel CAN signal fault |
Critical |
You need to manually rectify the fault or power off and restart the device. |
CAN communication signals are lost for 6s in a parallel system. |
The system shuts down the inverter and transfers to bypass mode. If other UPSs in the parallel system can deliver output in inverter mode, the UPS that has generated the alarm delivers no output. |
Measure: Send the device to the maintenance center.
Measure: Check the cable connection. |
81 |
Parallel UPS host signal fault |
Critical |
You need to manually rectify the fault or power off and restart the device. |
The UPS host signal is lost for more than 60 ms in a parallel system. |
The system shuts down the inverter and transfers to bypass mode. If other UPSs in the parallel system can deliver output in inverter mode, the UPS that has generated the alarm delivers no output. |
Possible cause: The circuit is faulty. Measure: Send the device to the maintenance center. |
82 |
Parallel synchronization signal fault |
Critical |
You need to manually rectify the fault or power off and restart the device. |
The synchronization zero-crossing signal is lost for more than 200 ms. |
The system shuts down the inverter and transfers to bypass mode. If other UPSs in the parallel system can deliver output in inverter mode, the UPS that has generated the alarm delivers no output. |
Possible cause: The circuit is faulty. Measure: Send the device to the maintenance center. |
83 |
Parallel battery voltage deviation exceeding 4 V |
Critical |
The voltage difference is less than 3 V or the UPS is set to standalone mode. |
The battery voltage deviation between UPSs in a parallel system is greater than 4 V for 120 ms. |
The system shuts down the inverter and transfers to bypass mode. If other UPSs in the parallel system can deliver output in inverter mode, the UPS that has generated the alarm delivers no output. |
Possible cause: Batteries are not shared. Measure: Ensure that all UPSs share one battery string. |
84 |
Inconsistent AC input voltage and frequency |
Critical |
The voltage difference is less than 20 V or the UPS is set to standalone mode. |
The mains voltage deviation between UPSs in a parallel system ranges from 40 V to 100 V for 120 ms. |
The system shuts down the inverter and transfers to bypass mode. If other UPSs in the parallel system can deliver output in inverter mode, the UPS that has generated the alarm delivers no output. |
Possible cause: The UPSs do not share one mains supply. Measure: Ensure that all UPSs share one mains supply. |
87 |
EPO triggered |
Critical |
The EPO open-circuit status needs to be restored and the alarm needs to be manually cleared. |
The EPO port is short-circuited. |
The system switches off the output and enters the fault mode. |
Check and restore the EPO port status. |
BP |
Battery not connected |
Minor |
The battery voltage is higher than 36 V. |
|
If batteries are not connected, the output may be interrupted after mains outage. |
Check whether battery cables are correctly connected. |